/Engine/Source/Runtime/LiveLinkInterface/Public/LiveLinkLog.h
Write a repeatable message in to the LiveLink log. Will returns a valid TokenizedMessage if a new TokenizedMessage was created. If the info occurred more than once for that SubjectKey, a counter will indicate the number of time it did occurred.
template<typename FormatType, typename... ArgsType> static [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FTokenizedMessage](API\Runtime\Core\Logging\FTokenizedMessage) > TokenizedMessageOnce ( [EMessageSeverity::Type](API\Runtime\Core\Logging\EMessageSeverity__Type) Severity, [FName](API\Runtime\Core\UObject\FName) MessageID, const [FLiveLinkSubjectKey](API\Runtime\LiveLinkInterface\FLiveLinkSubjectKey) & SubjectKey, const FormatType & Format, ArgsType... Args )